Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9c2a66b9a1f8c62bfedb856783344e15f1e4cdfc5db28041b2fbfc748cfd93' 
  AND token = 'Hn1SdF9+OtxH4XOHrbF0ZuzAbbU1bb36ozuIyDpjEyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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