Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280f3abeb71ed14dd965d8da1ba8a38bc3f7e9cb7850973d2507b37623797b6b' 
  AND token = '5n5TycG2v9xa89vtFM9yd7JCI0OEFCE8YM4IggtymtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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