SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cd7158397d2563b6327001482938797485f46367bba941b65a298face056d6' 
  AND token = 'YAvkTfxNQhlJ+VVg2lQhhPqKxJ6irksPeqbRP+7yHnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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