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.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    5390, 5391, 5392, 5393, 5394, 5395, 5396, 
    5397, 5398, 5399, 5400, 5401, 5402, 
    5403, 5404, 5405, 5406, 5407, 5408, 
    5409, 5410, 5411, 5412, 5413, 5414, 
    6728, 515, 3156, 3676, 5131, 3834, 3833, 
    2130, 2131, 2132, 2133, 2134, 2135, 
    2136, 2137, 2138, 2139, 2140, 2141, 
    2142, 2143, 2144, 2145, 2146, 2147, 
    2148, 2149, 2150, 2151, 2152, 2153, 
    2154, 2155, 2156, 2157, 2158, 2159, 
    2160, 2161, 2162, 2163, 2164, 2165, 
    2166, 2167, 2168, 2169, 2170, 2171, 
    2172, 2173, 2174, 2175, 2176, 2177, 
    2178, 2179, 2180, 2181, 2182, 2183, 
    2184, 3779, 3780, 3781, 3782, 3783, 
    3784, 3785, 3786, 3787
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00199

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "115.60"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "index_condition": "((`gaseus`.`cscart_product_descriptions`.`product_id` in (5390,5391,5392,5393,5394,5395,5396,5397,5398,5399,5400,5401,5402,5403,5404,5405,5406,5407,5408,5409,5410,5411,5412,5413,5414,6728,515,3156,3676,5131,3834,3833,2130,2131,2132,2133,2134,2135,2136,2137,2138,2139,2140,2141,2142,2143,2144,2145,2146,2147,2148,2149,2150,2151,2152,2153,2154,2155,2156,2157,2158,2159,2160,2161,2162,2163,2164,2165,2166,2167,2168,2169,2170,2171,2172,2173,2174,2175,2176,2177,2178,2179,2180,2181,2182,2183,2184,3779,3780,3781,3782,3783,3784,3785,3786,3787)) and (`gaseus`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "106.01",
        "eval_cost": "9.60",
        "prefix_cost": "115.61",
        "data_read_per_join": "438K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}