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 = 7214 
WHERE 
  cscart_products_categories.product_id IN (
    85018, 85024, 85030, 85036, 85017, 85023, 
    85029, 85035, 89215, 89228, 89241, 
    88176, 88224, 88244, 88248, 88772, 
    88531, 87461, 88501, 85729, 85746, 
    85756, 85766, 85736, 88771, 88174, 
    88222, 88243, 88247, 89454, 89467, 
    89475, 89483, 88200, 88212, 88236, 
    88240, 88678, 88725, 88534, 89459, 
    88979, 88996, 87465, 88499, 85672, 
    85692, 85704, 85716, 88528, 87514, 
    87530, 88452, 88469, 88485, 88985, 
    85680, 87464, 88677, 88724, 85727, 
    85744, 85754, 85764, 88770, 88198, 
    88210, 88235, 88239, 89452, 89465, 
    89473, 89481, 85734, 89969, 90839, 
    90841, 88242, 88246, 89457, 88978, 
    88995, 87547, 88406, 88676, 88723, 
    88569, 85726, 85743, 85753, 85763, 
    87518, 87534, 88450, 88467, 88483
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01695

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "136.86"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "11.20"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "ALL",
            "possible_keys": [
              "PRIMARY",
              "c_status",
              "p_category_id"
            ],
            "rows_examined_per_scan": 208,
            "rows_produced_per_join": 8,
            "filtered": "4.00",
            "cost_info": {
              "read_cost": "20.72",
              "eval_cost": "0.83",
              "prefix_cost": "21.55",
              "data_read_per_join": "21K"
            },
            "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": "cscart_products_categories",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "link_type",
              "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": 11,
            "filtered": "1.14",
            "cost_info": {
              "read_cost": "2.33",
              "eval_cost": "1.12",
              "prefix_cost": "121.75",
              "data_read_per_join": "179"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (85018,85024,85030,85036,85017,85023,85029,85035,89215,89228,89241,88176,88224,88244,88248,88772,88531,87461,88501,85729,85746,85756,85766,85736,88771,88174,88222,88243,88247,89454,89467,89475,89483,88200,88212,88236,88240,88678,88725,88534,89459,88979,88996,87465,88499,85672,85692,85704,85716,88528,87514,87530,88452,88469,88485,88985,85680,87464,88677,88724,85727,85744,85754,85764,88770,88198,88210,88235,88239,89452,89465,89473,89481,85734,89969,90839,90841,88242,88246,89457,88978,88995,87547,88406,88676,88723,88569,85726,85743,85753,85763,87518,87534,88450,88467,88483))"
          }
        },
        {
          "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": 11,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "2.80",
              "eval_cost": "1.12",
              "prefix_cost": "125.67",
              "data_read_per_join": "179"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        }
      ]
    }
  }
}