Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7159992046f472b9123dd78490d87cbc3ed63963a7852b37b377bf10c70739' 
  AND token = 'F97klOzEl9w9KsTyOzENk0hfDb4mYA7jqdl7DzOt48U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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