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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 (538, 272, 273, 274) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00365

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": 4,
      "filtered": 100,
      "index_condition": "cscart_ult_product_descriptions.product_id in (538,272,273,274)",
      "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
273	A		Tripod, Head, Quick, Shoe, Clamp, Arca-Swiss, rrs, kirk, foba	Markis QL-60 is Dovetail type lever release clamp with a spring loaded detent pin to prevent from accidental slippage. Compatible with any Arca-Swiss type camera plates from Arca, Foba, Kirk and R.R.S.
274	A		Tripod, Head, Quick, Shoe, Clamp, Arca-Swiss, rrs, kirk, foba	Markis QR-60N is Dovetail type knob release clamp with a spring loaded detent pin to prevent from accidental slippage. Compatible with any Arca-Swiss type camera plates from Arca, Foba, Kirk and R.R.S.
538		3/8"-16 to 1/4"-20 bush adapter <p></p> <div style="font-size:16px; border-bottom:dotted 1px #666666;margin:60px 0 20px 0;padding-bottom:8px;">Specification</div> <table align="center" width="100%" cellpadding="5" cellspacing="1" bgcolor="#424242" style="font-size: 10pt; color:#424242;"> <tr> <td align="middle" bgcolor="#ffffff"><div align="center"><strong>Code</strong></div></td> <td align="middle" nowrap="nowrap" bgcolor="#ffffff"><div align="left">BU1</div></td> </tr> <tr> <td align="middle" nowrap="nowrap" bgcolor="#ffffff"><div align="center"><strong>Weight</strong></div></td> <td align="middle" nowrap="nowrap" bgcolor="#ffffff"><div align="left">1.4g</div></td> </tr> </table>