Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975045d52336fc15c6a05fce27d1d4bc1ad943fc5236bf044d7cd36447efae3f' 
  AND token = '1pz3fiPJl3avjaia+B+rt4gQ8NrgeMXLGa9Q3lQyR4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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