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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1606, 2106, 2162, 2374, 2415, 761, 1661, 
    1685, 2118, 1659, 2174, 2344
  ) 
  AND cscart_product_descriptions.lang_code = 'de'

Query time 0.00111

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "11",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 12,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1606,2106,2162,2374,2415,761,1661,1685,2118,1659,2174,2344) and cscart_product_descriptions.lang_code = 'de'"
    }
  }
}