SELECT 
  category_id, 
  parent_id 
FROM 
  cscart_categories 
WHERE 
  parent_id IN(
    1937, 1938, 1939, 2338, 2581, 2579, 2580, 
    2582, 2583, 2584, 2585, 2586, 2601, 
    9929
  )

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "7.42"
    },
    "table": {
      "table_name": "cscart_categories",
      "access_type": "range",
      "possible_keys": [
        "parent"
      ],
      "key": "parent",
      "used_key_parts": [
        "parent_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 16,
      "rows_produced_per_join": 16,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "4.22",
        "eval_cost": "3.20",
        "prefix_cost": "7.42",
        "data_read_per_join": "94K"
      },
      "used_columns": [
        "category_id",
        "parent_id"
      ],
      "attached_condition": "(`webmarco`.`cscart_categories`.`parent_id` in (1937,1938,1939,2338,2581,2579,2580,2582,2583,2584,2585,2586,2601,9929))"
    }
  }
}