Sandbox

SELECT 
  category_id, 
  parent_id 
FROM 
  cscart_categories 
WHERE 
  parent_id IN(
    867, 492, 493, 497, 494, 865, 495, 917, 
    496, 499
  )

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cscart_categories	range	parent	parent	3		18	Using index condition