SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9915c5c53c7a2895991cf561471a32bdea474e01495724ec886f16dea6f2372b' 
  AND token = '1VDQLAYXGbIki/3qO88MsITUDhJvPp0AZyqXeWr7HmM=' 
  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"
    }
  }
}