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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 (
    51830, 51829, 59337, 52214, 51828, 51816, 
    51812, 51811, 51786, 51785, 51813, 
    51802, 51801, 51800, 51799, 51798, 
    51797, 51796, 51795, 51794, 51793, 
    51792, 51791, 51790, 51789, 51788, 
    51753, 51752, 51751, 51750, 51782, 
    51735, 91670, 91669, 91668, 51653, 
    51646, 51638, 51637, 51636, 51635, 
    111382, 51609, 51605, 51587, 51581, 
    51580, 51666, 51665, 51664, 51663, 
    51662, 51557, 51555, 51534, 51533, 
    51532, 51531, 51530, 51529, 51520, 
    51437, 51694, 51430, 51425, 51338, 
    51337, 51319, 51768, 51418, 51287, 
    51198, 51127, 51126, 51098, 51097, 
    51096, 51095, 51094, 51093
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00046

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