SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10420, 10419, 10418, 10417, 12856, 10416, 
    10415, 10414, 12855, 12854, 12853, 
    10412, 10411, 10410, 10409, 10408, 
    10407, 10406, 15781, 10405, 10404, 
    10403, 10402, 10401, 10400, 10399, 
    10398, 10397, 10395, 10394, 10393, 
    10392
  )

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 32,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10420,10419,10418,10417,12856,10416,10415,10414,12855,12854,12853,10412,10411,10410,10409,10408,10407,10406,15781,10405,10404,10403,10402,10401,10400,10399,10398,10397,10395,10394,10393,10392)"
    }
  }
}