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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b21af48ce982022d783d5fb2accf4c9f5853a9cb1f6b73e453c4ad8d75110cd5' 
  AND token = '4JUyzwl4WOf6l3wdS2GUUb8YDc/TxgNNNL4h5VJQtFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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