Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bf311ca9b9dc923403eb96cc89f71f9b2f496ec91d71eb0cf64e92bebad025' 
  AND token = 'O+bL0iaLo+m74EPUklhkNTZVQVIkR+68qgE4Zqmdb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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