Okay, have done some testing this morning to an LBP6300 that uses the CAPT driver.
First of all, I can get the queue to show the same as you have by stopping the CAPT Backgrounder service. This was achieved by deleting the "CUPSCAPT.BG.plist" file in HD > Library > LaunchAgents and then restarting the Mac. After logging in, I opened Activity Monitor to check that the CAPT Backgrounder was not listed, which is wasn't. I then opened Print & Scan and added the LBP6300 connected via USB to the Mac. The queue URI then looked like this, which is similar to what you have.
usb://Canon/LBP6300?serial=001E8F2968D0
When I then tried to print the job would just sit in the queue. And if I opened the CAPT Utility, I would get this message about the Statusmonitor.

So I then deleted the printer and manually started the CAPT Backgrounder, by double-clicking on the file "Canon CAPT Backgrounder", which is located in HD > Library > Printers > Canon > CUPSCAPT > Backgrounder. I then opened Activity Monitor to check that the CAPT Backgrounder was listed, which it was. Note that if the Backgrounder service is already running, you will get this error message when you double-click on the "Canon CAPT Backgrounder" file.

So with the Backgrounder running, I then opened Print & Scan and added the printer. I then checked System Information and the queue URI was now showing;
cnbma://localhost:59687
With the queue now configured correctly, I was able to print to the LBP.
So, for you, please open Activity Monitor to check if the CAPT Backgrounder service is listed. If it is not shown, then navigate to HD > Library > Printers > Canon > CUPSCAPT > Backgrounder and double-click the "Canon CAPT Backgrounder" file. Does this make the service appear in Activity Monitor or do you get an error message like above?
If the CAPT Backgrounder now appears in Activity Monitor, remove the current LBP printer in Print & Scan and add it again. Then check System Information to see if the queue has been created correctly. If it has created as shown above, then see if you can print. If it still shows usb instead of cnbma, then let me know.