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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '872e6735581e84da19dcdd13c62e064e037b6065047bf112e4891e2f9de722fa' 
  AND token = 'mXSRowBT3Nfzqkb4Uf1SAHTanynRAD8rHUWHaAIDiV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00752

JSON explain

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