SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c33b581f01a4c53c86794fe996510e1d042da76cbd218d9507c7f8e8f03317e' 
  AND token = 'AEl+bKOENbXvZJ+yFGVBPmrVeu5gdK0WvMV3UZIgYRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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