Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4a317894c228dcf159599cafa5b2d92809c075725de542824b40249896721b' 
  AND token = 'rP5fbOL4sBq1znsGZ01rtrLCSI+Mq5z0x6ob8N6ui5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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