Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dee602ca67291573e1f150ad6ac5fda06d949d9f563cf00cb6568e80623bf6' 
  AND token = '5aKQx/6LOB/Sr0uBq0ivT29zrfUAMagxqgQPoHJSyNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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