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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5aaef0cdc2e54e1fa4c31af38623c3cfbb58b4aa9c0d1a32dddc2b212ae7da0f' 
  AND token = '8OO31/mIJLhXSG4B1OFHCHJ7SEsvIr6r2Okt5gng2PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00782

JSON explain

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