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SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (96, 97, 100, 98, 101, 99) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "product_id",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 6,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (96,97,100,98,101,99)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	meta_keywords	meta_description
96	BT041	BIOTHERM 15	BIOTHERM 15
97	<p>BT041 Skid (30)</p><p><strong>30 Systems On Skid</strong></p><ul><li>Skid Weight - 161 lbs.</li><li>Skid Size - 48" x 40" x 88"</li><li># Of Boxes On Skid - 30</li><li>Skid Class - 300</li></ul>	BIOTHERM 15	BIOTHERM 15
98	<p>BT049 Skid (16)</p><p><strong>16 Systems On Skid</strong></p><ul><li>Skid Weight - 136 lbs.</li><li>Skid Size - 48" x 40" x 81"</li><li># Of Boxes On Skid - 16</li><li>Skid Class - 300</li></ul>	BIOTHERM 30	BIOTHERM 30
99	<p>BT020 Skid (16)</p><p><strong>16 Systems On Skid</strong></p><ul><li>Skid Weight - 145 lbs.</li><li>Skid Size - 48" x 40" x 77"</li><li># Of Boxes On Skid - 16</li><li>Skid Class - 300</li></ul>	BIOTHERM 45	BIOTHERM 45
100	<p>BT049</p>	BIOTHERM 30	BIOTHERM 30
101	<p>BT020</p>	BIOTHERM 45	BIOTHERM 45