Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b121f6ca52f5675b02b4feb476e63f2c90fdad85c6f2bd45442a8470ade563' 
  AND token = 'gWT16pjOuP29lEDw6KZPZCPW0MKi9bk73t0e0vyOn0A=' 
  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"
    }
  }
}