SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9fc55f6cc70d9f92f98c1ee3fbf109341e3a0a6bf964a74f7b1d806d558850' 
  AND token = 'P/JNQggpcFi5o9DkKluzChppWQGSHh0in813qUI5Kew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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