SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8568d8e1a07b26b5bb9a21e39880b61c878322a2f3b730b693970c36ed64f13' 
  AND token = 'qFElPPwymZR8q+jJbC8RKBaAnLj4Y/OKbw5QeTqvogI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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