Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bd468555b47a33fdfaf3551ae5e027ed3dcf818e1edb7bde2123faa6c3a9fa' 
  AND token = 'BMhrRjtDyG3Ts4WqzeaT30AiiOoWgrlP4aWRnYPU6iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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