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SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '', 
    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 (5025, 5026, 5027) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00020

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": 3,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (5025,5026,5027)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	full_description	search_words
5025	<p><span data-bind="text: label">Chemistry</span>: <span data-bind="text: value">LI-ION 3400 MAH</span></p><p><span data-bind="text: label">Intrinsic Safety Rating</span>: <span data-bind="text: value">NO RATING</span></p><p><span data-bind="text: label">IP Rating</span>: <span data-bind="text: value">IP68</span></p><p><span data-bind="text: label">Technology</span>: <span data-bind="text: value">IMPRES 2</span></p>
5026			APX6000, APX7000, APX8000, APEX6000, APEX7000, APEX8000, APX6000XE, APX7000XE, APX 6000, APX 7000, APX 8000
5027		<p>5100 mAh, IP68, IMPRES 2 battery for APX 8000, 7000/7000XE, 6000/6000XE, and SRX 2200</p>