Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8eb507cdd588d0897afd00d462c1e885f5fd4f8485d2c121c0d0c05c64164de' 
  AND token = 'hdo4qAxwTown68Se/YSpWrWUCNYJtoa/n+sHj49Ax2I=' 
  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"
    }
  }
}