SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6051588ebb4ba6cb453b4d132e2a48f410d4de309eb32fb4af4f472351991b' 
  AND token = 'v7wKvF9WnHWeFBo8yHYB/++LwKcKnCoVDChTZTfcgZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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