Here are the pictures. It was late and I shorted 2 pins of the smart card reader ribbon connector. Don't know how such a stupid mistake, but this component on the other side of the board went up and smoke and now I need to figure out what it is.
From the 4 pins shorted together, the pinout corresponds to a SOT-23-6 single MOSFET. Here's an absolutely random datasheet from the internet, which has no relation to your component, but it's a SOT-23-6 MOSFET... so you get the idea:
If you shorted VCC and GND on the connector, then that's probably the MOSFET that controls the power supply for the smart card reader. That means most likely a PMOS in the VCC line.
You should desolder it and check the voltage on its source pin is indeed whatever supply voltage your smartcard reader wants. Then check continuity between the drain pins and VCC on your connector. If there is continuity, then it's a PMOS in the VCC line, and you can substitute with another PMOS of "suitable" specs... I'll leave that as an exercise to the reader, but if you know voltage, gate drive voltage, and maximum current, you'll be able to search for a PMOS that will work.