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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '084893ebcf3a8357be804e0958a6f149e145b911c909610f3b168679a2ee121d' 
  AND token = 'bj0H44R4MWzdURCX9GqBz8e2QuaMP8W3njkhHh+5WW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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