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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038ff0f7021d4bc70bd0febd7c8569c86938c127e7477ebcfa4af82073af3424' 
  AND token = 'VKY8YKozOiVscaXyuDFRzK/UVpd08yIGCB4kYDjtQOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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