Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af013462b8e9d01981c34425ebeed32899e491ddfaf6abe4279cb90ba41ca3fa' 
  AND token = 'xqeM2Hiz28uGNbz/+aILAp2dFca4z48HKsGYHYyzk14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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