Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1a0b548840285b1dd69cd1817e07e47f8378e3f77d0ee65e74f3906abfb491' 
  AND token = '0Tiht+jKkCC8Jx6ACNUSWPMrwxb3vNvSk1z1EHSWxGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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