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.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    42, 39, 40, 205, 37, 152, 160, 74, 73, 71, 
    75, 72, 108, 237, 191, 235, 70, 122, 115, 
    156, 90, 175, 196, 43, 104, 76, 129, 127, 
    121, 103, 95, 182, 41, 56, 57, 30, 112, 
    246, 89, 197, 208, 173, 97, 229, 211, 
    210, 209, 67, 25, 116, 213, 215, 226, 
    200, 154, 53, 52, 111, 82, 84, 228, 85, 
    88, 26
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.02364

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "89.81"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 64,
      "rows_produced_per_join": 64,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "77.01",
        "eval_cost": "12.80",
        "prefix_cost": "89.81",
        "data_read_per_join": "292K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ],
      "attached_condition": "((`twebezli_Commercemodalpopup`.`cscart_product_descriptions`.`product_id` in (42,39,40,205,37,152,160,74,73,71,75,72,108,237,191,235,70,122,115,156,90,175,196,43,104,76,129,127,121,103,95,182,41,56,57,30,112,246,89,197,208,173,97,229,211,210,209,67,25,116,213,215,226,200,154,53,52,111,82,84,228,85,88,26)) and (`twebezli_Commercemodalpopup`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}