SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65673, 65795, 64620, 65794, 65533, 65532, 
    65301, 65770, 65616, 65460, 65302, 
    65417
  )

Query time 0.00074

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": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (65673,65795,64620,65794,65533,65532,65301,65770,65616,65460,65302,65417)"
    }
  }
}

Result