Still I have tried to accelerate this unconfirmed transaction with the antpool's user prioritize transaction accelerator. I am really confuse that why you find delay by reading the above sr members replies. However, this could be last try from my side. Please check that below.
https://www.antpool.com/user/prioritiseTransaction.htm?m=savePrioritiseTx

Please wait for some hours and check back that whether your transaction is getting accelerated or not. Good luck...