SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fd5928ab8ee55c8962b9c629c2bc2abbc915bff984b34f27ca04e6133e5f6d' 
  AND token = 'vG8DYBbX+l1lkK/5anBojhvR2yHZKJwIlXynBNyOXNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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