Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3470d272cf7c07e08ff5fdc7886c4a812d8f51769392bd8710a4920237885ca' 
  AND token = 'TVUY/E7cFceEEHAuGo2J2lpknscHrY0Ro96854Ol920=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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