Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1863f74156ff73d280462866e029ab5ff77cf2659c7b2fdf4935630c356dd749' 
  AND token = 'xS20uAoudIv167uiy0V9DcmN38v8R6/jiifmD0VlKFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}