Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92a1fe3f930b7a006b68da0a3454ee27133084ddcf5f0da135674ed9571a918' 
  AND token = 'jGhdoSub7YAZucyhJ7fNRal8V46NkcPqj5bxSdvxxQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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