SELECT 
  product_id, 
  short_description, 
  full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  product_id IN (140, 141, 144, 143) 
  AND lang_code = 'en'

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "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": 4,
          "filtered": 100,
          "index_condition": "cscart_product_descriptions.product_id in (140,141,144,143)",
          "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
        }
      }
    ]
  }
}

Result

product_id short_description full_description
140 <p>This easy-to-carry, powerful speaker system frees your iPod/iPhone music for your active lifestyle. Enjoy your entire content library whenever you want, wherever you go.</p>
141 <p>This easy-to-carry, powerful speaker system frees your iPod/iPhone music for your active lifestyle. Enjoy your entire content library whenever you want, wherever you go.</p>
143 <p>A certified "works with iPhone" Desktop Audio product that every iPhone or iPod fan who wants to enjoy a higher sound quality with a powerful output needs to have! The PDX-30 includes a card-type remote control for additional convenience.</p>
144 <p>A certified "works with iPhone" Desktop Audio product that every iPhone or iPod fan who wants to enjoy a higher sound quality with a powerful output needs to have! The PDX-30 includes a card-type remote control for additional convenience.</p>