Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3c6598efe2099fccd3e1e57dd6176cdd8bef1bcd954d7498ff4125577ab82b' 
  AND token = 'rGo93AsycubeFy4wZEksDoCBJHQfAJ2vqWhgHgmf1hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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