SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fe54407fb67bfd2a8e3707221744b27b51a63810862cb81b91a8762c9e84aad8' 
  AND token = 'bSioUIuxk6GKH4g04m3RV7fTP3y/NsGb3qQ6hxowwBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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