Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be1107ec7ed422ae1306659748ab9c3bee09c89145d64f8fe6ed71c19a65400' 
  AND token = 'uCgfxedv6ifDR0GgJsvXwkpyNXmfgDVEWoc+OO3RUfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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