SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7d56a9d270e9327db25979678dfd2e07f38c4f709c12d58281b59c691aa611aa' 
  AND token = 'CHP0jH+g13Tz+R/NcX5zlbtuqs9vcBzhoFXJ9+gdmUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00785

JSON explain

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