From Wikipedia, possibly one of the earliest uses of the word:

Black American folk singer-songwriter Huddie Ledbetter, a.k.a. Lead Belly, uses the phrase near the end of the recording of his 1938 song "Scottsboro Boys", which tells the story of nine black teenagers accused of raping two white women, saying: "I advise everybody, be a little careful when they go along through there – best stay woke, keep their eyes open."

Jay