SELECT 
  category_id, 
  parent_id 
FROM 
  q_categories 
WHERE 
  parent_id IN(
    7, 159, 168, 184, 292, 360, 406, 425, 438, 
    445, 519, 596, 367, 619
  )

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "114.81"
    },
    "table": {
      "table_name": "q_categories",
      "access_type": "range",
      "possible_keys": [
        "parent"
      ],
      "key": "parent",
      "used_key_parts": [
        "parent_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 72,
      "rows_produced_per_join": 72,
      "filtered": "100.00",
      "index_condition": "(`portal`.`q_categories`.`parent_id` in (7,159,168,184,292,360,406,425,438,445,519,596,367,619))",
      "cost_info": {
        "read_cost": "100.41",
        "eval_cost": "14.40",
        "prefix_cost": "114.81",
        "data_read_per_join": "190K"
      },
      "used_columns": [
        "category_id",
        "parent_id"
      ]
    }
  }
}