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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9d612f194b3e222df6a4234a27f3a971f8eb1ef13ce0fb4ade70bcb1fbc45d8f' 
  AND token = 'yh3ZBpoV2MuxfWngvXSNFXqgSeYfV7F2Ooz3k4teHUo=' 
  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"
    }
  }
}