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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'abd28934b74dd52547ce0337d297adeb1486fb01f27e767a8e27dd3f98b748e0' 
  AND token = 'xGSh9+FzfgJpAUps3jasOIMCO4KbxKuQfzunTbz+Cjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}