Today while attempting to query Events data through FQL, I received the following error:

Impersonated access tokens can only be used with the Graph API.

It was a strange error since I had already created my access token with the right scope. To query the data I’m using the pythonforfacebook SDK which uses https://api.facebook.com/method/fql.query as the url for FQL requests (REST API).
I then tried the graph method (https://graph.facebook.com/fql) which worked perfectly, but the response didn’t include Event pictures and I really need pictures to be present on my events listings. So what worked for me was to make a GET request thought the Graph API instead of a POST.
I use Requests for this so the code is very simple.

data = db.query(Model) #retrieve my access_token from DB
payload = {'q' : query, 'access_token': data.access_token,'format' : 'json'}
res = requests.get('https://graph.facebook.com/fql', params=payload)

With this change everything worked as expected.