Hello hai nie,
Here is the information regarding the LPSPI max frequency. I recommend you referring section 4.8.1 of the datasheet.
The LPSPI doesn't support qspi. If you want to use the LPSPI module your memory needs to support single SPI, but with this, you will be wasting resources. Based on the information you provided I think your best option is to use the FlexSPI module.
In the following document, you can find the Boot-up times for different memories on the RT1050 (link). As you can see, the times from XIP and SDRAM are almost the same. This same concept applies to the RT1020.
Have a great day,
TIC
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