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 = 7143 
WHERE 
  cscart_products_categories.product_id IN (
    100909, 100910, 100913, 100914, 100915, 
    100916, 100917, 100918, 100919, 100920, 
    100921, 100922, 101105, 101106, 101112, 
    101113, 101114, 101115, 101121, 101122, 
    101123, 101124, 101130, 101131, 101132, 
    101133, 101514, 101515, 101516, 101517, 
    101523, 101524, 101525, 101526, 101532, 
    101533, 101534, 101535, 101552, 101553, 
    101554, 101555, 101561, 101562, 101563, 
    101564, 101570, 101571, 101572, 101573, 
    101635, 101636, 101639, 101640, 101641, 
    101642, 101643, 101644, 101645, 101646, 
    101647, 101648, 101649, 101650, 101651, 
    101652, 101653, 101814, 101815, 101816, 
    101817, 101818, 101819, 101820, 101821, 
    101822, 101823, 101824, 101825, 101826, 
    101827, 101828, 101829, 101830, 101831, 
    101832, 101833, 101834, 101835, 101836, 
    101837, 101838, 101839, 101840, 101841, 
    101842
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01668

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "99.30"
    },
    "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": 110,
            "rows_produced_per_join": 110,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "11.30",
              "eval_cost": "11.00",
              "prefix_cost": "22.30",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (100909,100910,100913,100914,100915,100916,100917,100918,100919,100920,100921,100922,101105,101106,101112,101113,101114,101115,101121,101122,101123,101124,101130,101131,101132,101133,101514,101515,101516,101517,101523,101524,101525,101526,101532,101533,101534,101535,101552,101553,101554,101555,101561,101562,101563,101564,101570,101571,101572,101573,101635,101636,101639,101640,101641,101642,101643,101644,101645,101646,101647,101648,101649,101650,101651,101652,101653,101814,101815,101816,101817,101818,101819,101820,101821,101822,101823,101824,101825,101826,101827,101828,101829,101830,101831,101832,101833,101834,101835,101836,101837,101838,101839,101840,101841,101842))"
          }
        },
        {
          "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": 110,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "27.50",
              "eval_cost": "11.00",
              "prefix_cost": "60.80",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        },
        {
          "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": 5,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "27.50",
              "eval_cost": "0.55",
              "prefix_cost": "99.30",
              "data_read_per_join": "14K"
            },
            "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')))"
          }
        }
      ]
    }
  }
}