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 (6057, 6198) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00023

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": 2,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (6057,6198)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
6057 <p>2075 mAh Li-Ion ATEX rated EU model battery for DP4401, DP4801, XIRP8608, XIRP8668 and DP4000e Series. </p> DP4400e, DP4401e, DP4400, DP4000, DP4401, DP4801
6198 <p>ATEX rated battery for GP380EX, GP329EX, GP340EX, GP380EX, GP580EX (BLUE VERSION)</p><p><span data-bind="text: label">Chemistry</span>: <span data-bind="text: value">LI-ION 1420 MAH / 7.4V</span></p><p><span data-bind="text: label">Intrinsic Safety Rating</span>: <span data-bind="text: value">ATEX/IECEX</span></p><p><span data-bind="text: label">IP Rating</span>: <span data-bind="text: value">IP64</span></p><p><span data-bind="text: label">Technology</span>: <span data-bind="text: value">IMPRES</span></p> NNTN-5510, NNTN5510, NNTN-5510DR, NNTN5510AR, NNTN5510A, GP-380, GP-390, GP-340, GP-580