SELECT 
  category_id, 
  parent_id 
FROM 
  cscart_categories 
WHERE 
  parent_id IN(
    1904, 1906, 1905, 1913, 1911, 1907, 1909, 
    1908, 1910, 1912, 1914, 1915, 1917, 
    1918, 1916
  ) 
  AND category_id != 414

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "10.51"
    },
    "table": {
      "table_name": "cscart_categories",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "parent",
        "p_category_id"
      ],
      "key": "parent",
      "used_key_parts": [
        "parent_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 15,
      "rows_produced_per_join": 15,
      "filtered": "100.00",
      "index_condition": "(`s2cart`.`cscart_categories`.`parent_id` in (1904,1906,1905,1913,1911,1907,1909,1908,1910,1912,1914,1915,1917,1918,1916))",
      "cost_info": {
        "read_cost": "9.01",
        "eval_cost": "1.50",
        "prefix_cost": "10.51",
        "data_read_per_join": "53K"
      },
      "used_columns": [
        "category_id",
        "parent_id"
      ],
      "attached_condition": "(`s2cart`.`cscart_categories`.`category_id` <> 414)"
    }
  }
}