Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e921d0d0af847196af4c670b6f5b8e8cf17275b207d9eae3f055d47dea9a6597' 
  AND token = 'uKtit+Aq8AyoCPLphR7eMge/6N1n6zp+IASCKb5bDRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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