Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7465c8e0dad8877a9592b9914fb0c0d943afd6a144c2f06869264fbdd3c0f1' 
  AND token = 'XT5b5Fn2oggcGXAcfSn3wqnqmFpKAeVkPNQCrV91hnI=' 
  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"
    }
  }
}