Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ce38e850edf80623cfb9e8c02186e0097c023722ebb82dbefb66b71dcdff97' 
  AND token = 'YorYxnp7zljEfIlTCZ7TFVdWz0PHEdXmZ5IIsiuAUYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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