Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e853a6f6b768f47c45ad7c48fbfab21e048515fdf9c851f8f7e2ea1af0013211' 
  AND token = 'OfeFEcifJW+hznRaPep6gKh6d+TfJ4LK+8crgoxyCsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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