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 = 7228 
WHERE 
  cscart_products_categories.product_id IN (
    99891, 99892, 99893, 99894, 99895, 99896, 
    99897, 99898, 99899, 99900, 99901, 
    99902, 99903, 99904, 99905, 99906, 
    99907, 99908, 99909, 99910, 99911, 
    99912, 99913, 99914, 99915, 99916, 
    99917, 99918, 99919, 99920, 99921, 
    99922, 99923, 99924, 99925, 99926, 
    99927, 99928, 99929, 99930, 99931, 
    99932, 99933, 99934, 99935, 99936, 
    99937, 99938, 99939, 99940, 99941, 
    99942, 99943, 99944, 99945, 99946, 
    99947, 99948, 99949, 99950, 99951, 
    99952, 99953, 99954, 99955, 99956, 
    99957, 99958, 99959, 99960, 99961, 
    99962, 99963, 99964, 99965, 99966, 
    99967, 99968, 99969, 99970, 99971, 
    99972, 99973, 99974, 99975, 99976, 
    99977, 99978, 99979, 99980, 99981, 
    99982, 99983, 99984, 99985, 99986
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01593

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "86.69"
    },
    "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": 96,
            "rows_produced_per_join": 96,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "9.89",
              "eval_cost": "9.60",
              "prefix_cost": "19.49",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (99891,99892,99893,99894,99895,99896,99897,99898,99899,99900,99901,99902,99903,99904,99905,99906,99907,99908,99909,99910,99911,99912,99913,99914,99915,99916,99917,99918,99919,99920,99921,99922,99923,99924,99925,99926,99927,99928,99929,99930,99931,99932,99933,99934,99935,99936,99937,99938,99939,99940,99941,99942,99943,99944,99945,99946,99947,99948,99949,99950,99951,99952,99953,99954,99955,99956,99957,99958,99959,99960,99961,99962,99963,99964,99965,99966,99967,99968,99969,99970,99971,99972,99973,99974,99975,99976,99977,99978,99979,99980,99981,99982,99983,99984,99985,99986))"
          }
        },
        {
          "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": 96,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "24.00",
              "eval_cost": "9.60",
              "prefix_cost": "53.09",
              "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": 4,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "24.00",
              "eval_cost": "0.48",
              "prefix_cost": "86.69",
              "data_read_per_join": "12K"
            },
            "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')))"
          }
        }
      ]
    }
  }
}