Sandbox

SELECT 
  cscart_ult_product_descriptions.product_id, 
  cscart_ult_product_descriptions.short_description, 
  IF(
    cscart_ult_product_descriptions.short_description = "", 
    cscart_ult_product_descriptions.full_description, 
    ""
  ) AS full_description, 
  cscart_ult_product_descriptions.meta_keywords, 
  cscart_ult_product_descriptions.meta_description, 
  cscart_ult_product_descriptions.search_words, 
  cscart_ult_product_descriptions.promo_text 
FROM 
  cscart_ult_product_descriptions 
WHERE 
  cscart_ult_product_descriptions.product_id IN (
    49614, 49613, 49612, 49611, 49610, 49609, 
    49608, 49607, 49606, 49605, 49604, 
    49603, 49602, 49601, 49556, 49906, 
    49561, 49552, 49551, 49500, 49330, 
    49329, 49499, 49498, 50076, 49497, 
    49459, 49435, 49291, 49290, 49726, 
    49450, 49454, 49453, 49238, 49237, 
    49236, 49407, 49281, 49243, 49242, 
    49241, 49224, 49223, 49348, 49347, 
    49346, 49207, 49190, 49189, 49188, 
    49183, 49182, 49181, 49180, 49179, 
    49178, 49177, 49176, 49175, 49174, 
    49173, 49172, 49171, 49170, 49169, 
    49343, 49304, 49303, 49302, 49282, 
    49165, 49141, 49140, 49139, 49138, 
    49153, 49152, 49151, 49150
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00033

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cscart_ult_product_descriptions	ALL	PRIMARY,product_id,company_id				1	Using where