Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f7e8ea5fc30e37b695340606fb51fe926190a6b4ea46d450d3a86dfb7b257f' 
  AND token = 'SDfCPIFYUyIayWTmmuI94f6RntgKXun3VvYOiYhQ02s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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