I heard that the mempool gets flushed around Saturday or Sunday so your transaction will most likely confirm then. If not then there are some transaction accelerator services on this forum you can use to get it confirmed, including
one from Poolin that recently pushed someone's transaction containing funds that have been locked for almost a year. I recommend that if you are desperate, but there's also a free accelerator at
FREE/PAY BITCOIN TRANSACTION ACCELERATOR which people have used successfully.
The mempool doesn't actually get flushed at fixed timing, nor flushed at all. Individual nodes has their own mempool and by extension, their own mempool policy. This means that the time for which the transaction gets dropped by the nodes varies with the parameters or the time for which the transaction gets relayed to that node. Most accelerators merely rebroadcasts your transaction which does very little for your transaction, other than helping it propagate better. I doubt that anyone has actually had their transaction confirmed as a result of the "transaction accelerators" and without paying a pool to help them.
OP, I think that it might be a result of a fairly bad propagation to the block explorers and you won't be able to see them. If you want, you can go to Windows>Console and type in this
getrawtransaction 274c04dacfa70fe705466dc3f0ed998d1effc7c4658a0afcefab086328df42a8
Copy the output which is just a long string of characters and paste it here:
https://blockchair.com/broadcastOR
coinb.in/#Broadcast