Lock time basically means that that is the first moment it could possibly be added into the blockchain.
It basically cannot be accepted by miners before that block is reached.
Which in your case is block 500114, that block has passed a long time ago, so your transaction should now be able to confirm.
Oooh, i see, that clarifies the whole situation, thanks so much! However, it has a relatively low transaction fee of 200 satoshis per byte, so no miner has picked it up yet right? Do you think it would get picked up within the next day or so?