Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fa1acc2e1e3519eda5487798e32f94b5749d95719e929e09e440cce6dbcef1' 
  AND token = 'jCXIptOkIBy886aB7R20Id7IROv1lcnp7+bSwukXeMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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