SELECT 
  category_id, 
  parent_id 
FROM 
  cscart_categories 
WHERE 
  parent_id IN(
    11425, 11422, 11429, 2508, 6354, 11426, 
    5707, 11427, 11423, 11428, 11421, 28363, 
    28364
  )

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "2.96"
    },
    "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": 13,
      "rows_produced_per_join": 13,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "1.66",
        "eval_cost": "1.30",
        "prefix_cost": "2.96",
        "data_read_per_join": "33K"
      },
      "used_columns": [
        "category_id",
        "parent_id"
      ],
      "attached_condition": "(`maniamall_cscart`.`cscart_categories`.`parent_id` in (11425,11422,11429,2508,6354,11426,5707,11427,11423,11428,11421,28363,28364))"
    }
  }
}