Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1d9e23f5c9ab279534a24c85a96e58cda02163afd8b26229a949a4a901d83c' 
  AND token = '4LMYpthKbkMd5DSF3ZKik1aRKmXOnpRfakPttGkhmQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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