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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 (
    4135, 4814, 4845, 4846, 4844, 4848, 4847, 
    4849, 4843, 4842
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ult_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "company_id"],
      "key": "product_id",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 10,
      "filtered": 100,
      "index_condition": "cscart_ult_product_descriptions.product_id in (4135,4814,4845,4846,4844,4848,4847,4849,4843,4842)",
      "attached_condition": "cscart_ult_product_descriptions.company_id = 1 and cscart_ult_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	full_description	meta_keywords	meta_description	search_words	promo_text
4842		<p>IMPRES Industrial Noise Cancelling Microphone Submersible (IP57)</p>			NNTN8382A, XPR 6100 Speaker Mic, XPR 6350 Speaker Mic, XPR 6380 Speaker Mic, XPR 6550 Speaker Mic, XPR 6580 Speaker Mic, XPR 7350 Speaker Mic, XPR 7380 Speaker Mic, XPR 7550 Speaker Mic, XPR 7580 Speaker Microphones