Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dab17afe3351584f53bffb074c448717eecf94458054dd849771f6ded96d248' 
  AND token = 'sqMeVROULBB8BpGU9qKsrHDuDjip5IP6bQWsv3eiHbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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