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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 (
    46924, 46923, 46922, 46873, 46872, 46871, 
    46870, 46869, 46868, 46867, 46866, 
    46865, 46864, 46863, 46862, 46861, 
    46860, 46859, 46858, 46857, 46624, 
    46568, 46567, 46565, 46822, 46821, 
    46820, 46819, 46901, 46900, 46899, 
    46898, 46897, 46896, 46895, 46894, 
    46893, 46892, 46891, 46890, 46889, 
    46888, 46887, 46886, 46885, 46884, 
    46883, 46882, 46881, 46880, 46879, 
    46878, 46877, 46621, 46620, 46619, 
    46618, 46617, 46616, 46615, 46614, 
    46613, 46535, 46534, 46533, 46532, 
    46519, 46477, 46472, 46471, 46437, 
    46702, 46701, 46700, 46699, 46348, 
    46329, 46580, 46579, 46358
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00045

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