指定ログイン情報を使用している場合に OAuth トークンが自動で更新されない

HttpRequest req = new HttpRequest();
req.setEndpoint('callout:sfa/services/Soap/u/37.0/00DA0000000Ah7w');
req.setMethod('POST');
req.setHeader('Content-Type','text/xml; charset=utf-8');
req.setHeader('SOAPAction','wewew');
String payload='<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:partner.soap.sforce.com">'+
   '<soapenv:Header>'+
         '<urn:SessionHeader>'+
         '<urn:sessionId>{!$Credential.OAuthToken}</urn:sessionId>'+
      '</urn:SessionHeader>'+
   '</soapenv:Header>'+
   '<soapenv:Body>'+
      '<urn:query>'+
         '<urn:queryString>select id from contact limit 10</urn:queryString>'+
      '</urn:query>'+
   '</soapenv:Body>'+
'</soapenv:Envelope>';
System.debug('');
req.setBody(payLoad);
Http http = new Http();
HTTPResponse res = http.send(req);
System.debug(res.getBody());