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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f6efd6784b4e08025e07a88469ae67a3524a35a3dd27117f85978738284b40f7' 
  AND token = 'xsawHBXp1lJxBXRA+k5i4MGGx8UGE5KyLtxidMnbEHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00777

JSON explain

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