SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33ab3d01375692a94ae23db7a7255dcdded06250c6dfaa4f5c2d744f82c46fc' 
  AND token = 'w6KWgMWwmjGlZ708/HUiR006G0HVmkSKXwHq8MBDYxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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