Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffbb6efc81dabfb3416c3041f339e231921ff7ff9e1113ce8230fbe871ef91a' 
  AND token = '/W9AjAecJQxjDKQYGVgf6/HbCi1fSFfxy/zT0AqsIS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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