Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db708b9a9ad1639f4c3fce866f2bde2fad370e4ec0239ad504d420ca39fd85' 
  AND token = 'W3tDzXiTLDzgTetnJ6/Zqh80uICpkOM7gfdZEZJe3cs=' 
  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"
    }
  }
}