Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f8541a313b00819d37ffd8e3ddc0a3e49452353eb16041ced733c88bd7e198' 
  AND token = 'idLX22Bpby1N+dPShf+XpxIhBXysn45BQ92AFrc+FXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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