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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '57fe64be7ad8b3510e99904d4c9a1427534f78ca0944973e49ba59b959e7d3de' 
  AND token = 'zJvU8KQ4mmiEp9XDZ+HUbjbOa5pP9KUEifWM42iJ0ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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