The MLS won it in the 91st minute when Johnson, of the Seattle Sounders, blasted a shot that deflected off Chelsea defender David Luiz and past goalkeeper Ross Turnbull into the net.
San Jose's Chris Wondolowski also scored for the MLS, which won an all-star game against a European opponent for the first time since 2008.
John Terry and Frank Lampard scored for Chelsea.
Teacher apologizes for showing sexual image of herself in class
Interpol investigating stolen passports on missing flight