Sandbox

SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  MIN(
    IF(
      prices.percentage_discount = 0, 
      prices.price, 
      prices.price - (
        prices.price * prices.percentage_discount
      )/ 100
    )
  ) as price, 
  products.product_type, 
  products.parent_product_id, 
  products.rf_stop_update_price, 
  products.rf_stop_update_amount, 
  products.rf_stop_update_status 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
WHERE 
  1 
  AND cscart_categories.category_id IN (7182, 7183) 
  AND companies.status IN ('A') 
  AND products.company_id IN (2, 8, 9, 10, 0) 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND products.parent_product_id = 0 
  AND products.product_type != 'D' 
GROUP BY 
  products.product_id 
ORDER BY 
  price desc, 
  products.product_id ASC 
LIMIT 
  0, 48

Query time 0.00433

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "8.31"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 0,
              "filtered": "4.00",
              "cost_info": {
                "read_cost": "0.90",
                "eval_cost": "0.01",
                "prefix_cost": "0.91",
                "data_read_per_join": "213"
              },
              "used_columns": [
                "category_id",
                "usergroup_ids",
                "status",
                "storefront_id"
              ],
              "attached_condition": "((`nuie_scalesta_net`.`cscart_categories`.`category_id` in (7182,7183)) and ((`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`))) and (`nuie_scalesta_net`.`cscart_categories`.`status` in ('A','H')) and (`nuie_scalesta_net`.`cscart_categories`.`storefront_id` in (0,1)))"
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "rows_examined_per_scan": 5,
              "rows_produced_per_join": 0,
              "filtered": "33.33",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "0.17",
                "eval_cost": "0.01",
                "prefix_cost": "1.09",
                "data_read_per_join": "869"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "((`nuie_scalesta_net`.`companies`.`status` = 'A') and (`nuie_scalesta_net`.`companies`.`company_id` in (2,8,9,10,0)))"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "nuie_scalesta_net.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 117,
              "rows_produced_per_join": 15,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.04",
                "eval_cost": "1.57",
                "prefix_cost": "2.70",
                "data_read_per_join": "250"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "age_verification",
                "status",
                "idx_parent_product_id",
                "my_supplier_id",
                "supplier_access_time",
                "products_rf_product_code_index",
                "products_rf_manufacturer_code_index"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "nuie_scalesta_net.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "2.35",
                "eval_cost": "0.08",
                "prefix_cost": "6.62",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "usergroup_ids",
                "parent_product_id",
                "rf_stop_update_price",
                "rf_stop_update_amount",
                "rf_stop_update_status"
              ],
              "attached_condition": "((`nuie_scalesta_net`.`products`.`company_id` = `nuie_scalesta_net`.`companies`.`company_id`) and (`nuie_scalesta_net`.`products`.`parent_product_id` = 0) and ((`nuie_scalesta_net`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`nuie_scalesta_net`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`nuie_scalesta_net`.`products`.`usergroup_ids`))) and (`nuie_scalesta_net`.`products`.`status` = 'A') and (`nuie_scalesta_net`.`products`.`product_type` <> 'D'))"
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "nuie_scalesta_net.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.12",
                "eval_cost": "0.08",
                "prefix_cost": "6.82",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "nuie_scalesta_net.products_categories.product_id"
              ],
              "rows_examined_per_scan": 16,
              "rows_produced_per_join": 1,
              "filtered": "9.92",
              "cost_info": {
                "read_cost": "0.20",
                "eval_cost": "0.13",
                "prefix_cost": "8.32",
                "data_read_per_join": "30"
              },
              "used_columns": [
                "product_id",
                "price",
                "percentage_discount",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`nuie_scalesta_net`.`prices`.`lower_limit` = 1) and (`nuie_scalesta_net`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	price	product_type	rf_stop_update_price	rf_stop_update_amount	rf_stop_update_status
86856	Shower Accessories Shower Seat	Roxor	371.67000000	P	N	N	N
85583	Wastes & Extras Deck Shower Kit	Roxor	119.17000000	P	N	N	N
82561	Wetroom Screen Support Arm	Roxor	98.33000000	P	N	N	N
90268	Black Wetroom Screen Ceiling Post	Roxor	91.67000000	P	N	N	N
90264	3000mm Wetroom Screen Ceiling Post	Roxor	79.17000000	P	N	N	N
90266	Wetroom Wall Channel 1950mm Black Matt Black	Roxor	65.00000000	P	N	N	N
90273	Wetroom Wall Channel 1950mm Brass Brushed Brass	Roxor	65.00000000	P	N	N	N
91311	Wetroom Screen Accessories Flat Support Bar, 1202mm	Roxor	50.00000000	P	N	N	N
91313	Wetroom Screen Accessories Flat Support Bar, 1202mm	Roxor	50.00000000	P	N	N	N
91315	Wetroom Screen Accessories Flat Support Bar, 1202mm	Roxor	50.00000000	P	N	N	N
90267	RETURN SCREEN 'L' PROFILE Kit Black	Roxor	47.50000000	P	N	N	N
90274	Return Screen L Profile Kit 1950mm Brass	Roxor	47.50000000	P	N	N	N
85649	Wetroom Screen Support Arm Polished Chrome	Roxor	43.33000000	P	N	N	N
85650	Wetroom Screen Support Arm Matt Black	Roxor	43.33000000	P	N	N	N
85651	Wetroom Screen Support Arm Brushed Brass	Roxor	43.33000000	P	N	N	N
91312	Wetroom Screen Accessories Support Arm T Piece, 19mm x 53mm x 53mm	Roxor	16.67000000	P	N	N	N
91314	Wetroom Screen Accessories Support Arm T Piece, 19mm x 53mm x 53mm	Roxor	16.67000000	P	N	N	N
91316	Wetroom Screen Accessories Support Arm T Piece, 19mm x 53mm x 53mm	Roxor	16.67000000	P	N	N	N
90263	Wetroom Screen Support Foot	Roxor	15.83000000	P	N	N	N
90270	Black Wetroom Foot and Wall Bracket	Roxor	15.83000000	P	N	N	N
90269	Wetroom Screen Horseshoe Support Foot Matt Black	Roxor	14.17000000	P	N	N	N
90275	Wetroom Screen Horseshoe Support Brushed Brass	Roxor	14.17000000	P	N	N	N
90265	Wetroom Screen Horseshoe Support Polished Chrome	Roxor	13.33000000	P	N	N	N
93356	FIX027	Roxor	0.00000000	P	N	N	N
93357	FIX070	Roxor	0.00000000	P	N	N	N
93358	FIX071	Roxor	0.00000000	P	N	N	N
94117	WRSF039	Roxor	0.00000000	P	N	N	N
94958	AQVEN6106	Roxor	0.00000000	P	N	N	N
95683	ALRM22	Roxor	0.00000000	P	N	N	N
95702	AQVEN8101	Roxor	0.00000000	P	N	N	N
95703	AQVEN8102	Roxor	0.00000000	P	N	N	N
96841	AQVEN6106-P	Roxor	0.00000000	P	N	N	N
96918	AQVEN8101-P	Roxor	0.00000000	P	N	N	N
96919	AQVEN8102-P	Roxor	0.00000000	P	N	N	N
96998	ARM22-P	Roxor	0.00000000	P	N	N	N
98482	EA383-M	Roxor	0.00000000	P	N	N	N
98538	FIX023-P	Roxor	0.00000000	P	N	N	N
98539	FIX024-P	Roxor	0.00000000	P	N	N	N
98540	FIX025-P	Roxor	0.00000000	P	N	N	N
98541	FIX027-P	Roxor	0.00000000	P	N	N	N
98542	FIX030-P	Roxor	0.00000000	P	N	N	N
98543	FIX031-P	Roxor	0.00000000	P	N	N	N
98544	FIX040-P	Roxor	0.00000000	P	N	N	N
98545	FIX041-P	Roxor	0.00000000	P	N	N	N
98546	FIX070-P	Roxor	0.00000000	P	N	N	N
98547	FIX071-P	Roxor	0.00000000	P	N	N	N
98548	FIX080-P	Roxor	0.00000000	P	N	N	N
98549	FIX081-P	Roxor	0.00000000	P	N	N	N