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 = 7258 
WHERE 
  cscart_products_categories.product_id IN (
    88064, 89987, 87957, 88065, 88074, 88025, 
    87996, 88073, 88040, 87951, 88077, 
    87986, 87946, 87947, 87949, 88043, 
    87956, 88081, 88003, 88080, 88028, 
    88049, 87936, 88044, 93792, 93793, 
    94495, 94497, 94498, 94500, 94502, 
    94503, 94508, 94514, 94580, 94851, 
    95315, 95318, 95760, 95761, 95763, 
    95768, 95769, 95789, 95821, 95822, 
    95867, 95868, 95889, 95891, 95892, 
    96120, 96121, 96571, 97619, 97621, 
    97622, 97624, 97626, 97627, 97632, 
    97638, 97704, 98587, 98588, 98589, 
    98878, 98879, 98880, 98881, 98886, 
    98887, 98888, 99110, 99120, 99121, 
    99123, 99125, 99127, 99128, 99162, 
    99171, 99177, 99182, 99183, 99203, 
    99206, 99218, 99221, 99222, 99227, 
    99242, 99243, 99251, 99252, 99255
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01280

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 (88064,89987,87957,88065,88074,88025,87996,88073,88040,87951,88077,87986,87946,87947,87949,88043,87956,88081,88003,88080,88028,88049,87936,88044,93792,93793,94495,94497,94498,94500,94502,94503,94508,94514,94580,94851,95315,95318,95760,95761,95763,95768,95769,95789,95821,95822,95867,95868,95889,95891,95892,96120,96121,96571,97619,97621,97622,97624,97626,97627,97632,97638,97704,98587,98588,98589,98878,98879,98880,98881,98886,98887,98888,99110,99120,99121,99123,99125,99127,99128,99162,99171,99177,99182,99183,99203,99206,99218,99221,99222,99227,99242,99243,99251,99252,99255))"
          }
        },
        {
          "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')))"
          }
        }
      ]
    }
  }
}