SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '573c19f5dd920ffdfc82a1a689056c08f4bdf275649712bafc1ae0febd1d0c8d' 
  AND token = '4ZNn+Aw+10RFRBRsVBZtU0qA42v4qu6arhmgCvrXtHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01086

JSON explain

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