You do not qualify for the age-55 exception because you separated from service before the year that you reached age 55.
You do not qualify for the exception for a series of substantially equal periodic payments because you received a lump-sum buy-out of your pension, not a series of payments for life.
Other penalty exceptions for distributions from a qualified retirement plan are listed on the following IRS web page, but are less common than the ones listed above that you already do not qualify for:
https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-tax-on-early-distri...
