Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b137675ad1435f633037f6b1501ad751d14aac485f97960e8633634a830c51' 
  AND token = 'ZChnP0p04P2B5LSv6FCCwyD8b5bEcpHjJHDjHmUr5yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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