Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f697a8684f527acd5832cd3ea68934c29f91b887c34c9ebbac9404e8bdf61fa0' 
  AND token = '6KBnQW8b4zcYrYiAmMhNhMYODerY+T+4rkjcBxn2aHc=' 
  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"
    }
  }
}