Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c7a9f08e30e50f900f81e24e7a0cf6427b1db080dddb2777b55f788d3bb264' 
  AND token = 'h0EGD1BXkOXD/1GTmbDIlOJ8Mqw4XP4K9ilIO4zDnGI=' 
  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"
    }
  }
}