SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f601d4c074a57c786ab9fb7294d221589718ca793d5664bc3546d788f6be13f' 
  AND token = 'MKa6kTQzWum2g4xw5O2Wj7yxrjblZGg5FxH2lPBvO/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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