Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49da425bda56ce692d9bbb6bf5196aac52579fd5cd2b7cdde65dc477d497f552' 
  AND token = '6F+KjMY4EpChPJUe2B3fCrmFFyOIcdXhSZwnEz/pFrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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