SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58078d7482b85a759dd8f8a3594ce657bca6a0897bdfce9030af1c208584300b' 
  AND token = '4oG3hVRuY+bezCtDw1KkC8rgCGmP+C+7aU1F/xvi2MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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