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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7c56ff562c36e1df4fc1bcc1c0f9e175817737935b6181a02c5fa6a29e4622fb' 
  AND token = 'H7TE4TxJ/mSbC7ygUkmDOO/TP3DLOjpx/tITdNdZH+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00917

JSON explain

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