SELECT 
  cscart_products_categories.product_id, 
  GROUP_CONCAT(
    IF(
      cscart_products_categories.link_type = "M", 
      CONCAT(
        cscart_products_categories.category_id, 
        "M"
      ), 
      cscart_products_categories.category_id
    )
  ) AS category_ids, 
  product_position_source.position AS position 
FROM 
  cscart_products_categories 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  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') 
  LEFT JOIN cscart_products_categories AS product_position_source ON cscart_products_categories.product_id = product_position_source.product_id 
  AND product_position_source.category_id = 7184 
WHERE 
  cscart_products_categories.product_id IN (
    90108, 89006, 89013, 84007, 84009, 84011, 
    84013, 89010, 91307, 83963, 83965, 
    83967, 83969, 91303, 83130, 84006, 
    84008, 84010, 84012, 84035, 90089, 
    90099, 92027, 92028, 92029, 92030, 
    92031, 92032, 92033, 92035, 92036, 
    92037, 92038, 92039, 92040, 92041, 
    92115, 92116, 92117, 92118, 92119, 
    92120, 92121, 92123, 92124, 92125, 
    92126, 92127, 92128, 92129, 83962, 
    83964, 83966, 83968, 89005, 90079, 
    83111, 83121, 92255, 92256, 92257, 
    92496, 92497, 92498, 92499, 91296, 
    83101, 84107, 83999, 84001, 84003, 
    84005, 92051, 92052, 92053, 92054, 
    92055, 92056, 92057, 91550, 91619, 
    91788, 91789, 91790, 91791, 91792, 
    91793, 91794, 91795, 92254, 92026, 
    92034, 92114, 92122, 92501, 92502
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "84.30"
    },
    "grouping_operation": {
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_products_categories",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "link_type",
              "pt"
            ],
            "key": "pt",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 148,
            "rows_produced_per_join": 148,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "15.11",
              "eval_cost": "14.80",
              "prefix_cost": "29.91",
              "data_read_per_join": "2K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (90108,89006,89013,84007,84009,84011,84013,89010,91307,83963,83965,83967,83969,91303,83130,84006,84008,84010,84012,84035,90089,90099,92027,92028,92029,92030,92031,92032,92033,92035,92036,92037,92038,92039,92040,92041,92115,92116,92117,92118,92119,92120,92121,92123,92124,92125,92126,92127,92128,92129,83962,83964,83966,83968,89005,90079,83111,83121,92255,92256,92257,92496,92497,92498,92499,91296,83101,84107,83999,84001,84003,84005,92051,92052,92053,92054,92055,92056,92057,91550,91619,91788,91789,91790,91791,91792,91793,91794,91795,92254,92026,92034,92114,92122,92501,92502))"
          }
        },
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "c_status",
              "p_category_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id"
            ],
            "key_length": "3",
            "ref": [
              "nuie_scalesta_net.cscart_products_categories.category_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 7,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "37.00",
              "eval_cost": "0.74",
              "prefix_cost": "81.71",
              "data_read_per_join": "19K"
            },
            "used_columns": [
              "category_id",
              "usergroup_ids",
              "status",
              "storefront_id"
            ],
            "attached_condition": "((`nuie_scalesta_net`.`cscart_categories`.`storefront_id` in (0,1)) 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')))"
          }
        },
        {
          "table": {
            "table_name": "product_position_source",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "pt"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id",
              "product_id"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "nuie_scalesta_net.cscart_products_categories.product_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 7,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.85",
              "eval_cost": "0.74",
              "prefix_cost": "84.30",
              "data_read_per_join": "118"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        }
      ]
    }
  }
}