Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f185459f5954946e678645d1d443a99480fe5aeebf1b6f0deaff6318054ca4cd' 
  AND token = 'PRQGth3xhYJSBVgZ5Ons8iwkY95sbTMhu6Jnryi+3YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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