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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6f4a57c25a0c1bd6ea468f74ee9be6079aad32ddfb147f232744a69b0852d912' 
  AND token = 'tTbXlSFUlXUpVaFmV944UvUI/E2TLD6tz0fSPJl9mdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00795

JSON explain

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