Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe98f92c1784133f3b4950fabc7178aa8d0dcf63b50298a75f64548489b68db' 
  AND token = 'Bcupu9EAfTWsUpsTebyJqv2OZr42FuBIzcdgOSfc4fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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