Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00285f1d5b455f9f9291d6db4ecb7b7d2abfbb7576c411cd3251a4692b3a668d' 
  AND token = 'OtNgU9sIHli4fwbPtejczJ5Ex03SVbt9IsaRo/KBT88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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