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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 (
    5618, 5676, 5661, 5634, 5619, 6216, 2458, 
    2457, 2456, 2455, 2454, 2451, 2450, 
    6164, 2443, 2448, 2447, 2446, 2445, 
    2444, 85065, 85064, 78818, 78817, 2441, 
    2440, 2439, 5885, 2442, 78201, 5897, 
    2434, 2435, 2437, 2438, 2436, 6059, 
    2433, 2432, 2431, 2430, 6189, 6130, 
    6129, 6126, 6125, 6124, 6123, 6122, 
    5940, 2428, 2427, 2426, 2425, 6183, 
    2422, 2423, 2421, 2420, 2424, 2419, 
    2418, 2416, 2414, 6181, 5985, 77579, 
    6321, 26680, 6174, 6306, 2408, 2412, 
    2413, 2411, 2410, 2409, 2407, 6186, 
    103458
  ) 
  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