Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd6109dcf9feb8910fe40a3c22ebb9b9d8e8f712f5124020e32e01077d7ea5e' 
  AND token = 'uGYiTx2LDeQB2IASknxm5x0ZyC3ZZJa/k7GLxh0o3Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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