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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 (
    48374, 48373, 48372, 48371, 48370, 48369, 
    48368, 48367, 48366, 48365, 48364, 
    48363, 48362, 48361, 48360, 48359, 
    48358, 48357, 48356, 48355, 48354, 
    48353, 48352, 48351, 70736, 70735, 
    70734, 70733, 48051, 48033, 48032, 
    48031, 47866, 48025, 47884, 47883, 
    47851, 47885, 48028, 47854, 47850, 
    47849, 47813, 47723, 90955, 90954, 
    90953, 90952, 90951, 90950, 90949, 
    47810, 48013, 47836, 47815, 47814, 
    47808, 47689, 47818, 47778, 47777, 
    47776, 47775, 47763, 47762, 47761, 
    47760, 47639, 47744, 47743, 47742, 
    47746, 47604, 47603, 47602, 47601, 
    47600, 47599, 47598, 47597
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00064

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