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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f195a48931de45f5ea77aae8a387c3d7c88bc1fd4da93e9431c2e7d9a056b2f' 
  AND token = '4toEQCkSjCEnFjvY0kpbkty9aSUiWzginL6F//Nt1oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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