Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fac9b537a5df649aac8bc496dd407e7550210371ae354db5239c99be4cf8ba5' 
  AND token = '8U2dEOOIdhymi/ntP9MWEIcMUQRiTnc49nYuKE3rIr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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