Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f57c4cf2135df708ea81b9aff4cb1fe4aaca783d20c3de3e5a5df9565cbfb3' 
  AND token = 'pB3YqefDHCx7RuoP5CU9SKmkHXB3MTOQYAtNSCzOdio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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