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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '64f7dd3d05c44e96231a5e8dde5286b7f55354d3fa9c2d2df1547b19aa518ffc' 
  AND token = 'Ca1SAA7vO2By+afBo2RQINWIDjWl3uI0BoQS/rQ3iaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00837

JSON explain

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