Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15ea6156975d6ec8c2293291fd395d69b1cbe8ddaa35b93d596dbfc3652d265' 
  AND token = 'gdyLjy5brcSDCZuID5zJaRZKPj7rw1DVmQ+tq9tg88Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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