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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9f1b5d466ded0dd9b7e90b3fa6a565c156ec75f97d452a3e533961affcfe02dd' 
  AND token = '9H8UIEA1RdSdlMVpIlN1TeBYHVasgl6odkl6/HiJ2/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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