Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68a25eef55d59433d6e06a195d5c5faf0bbc58a9e9802a39ede6ca2e8ceacfc' 
  AND token = 'OVyedUQagLt78HutUn7/ZcgRwRk+S7eDec+vwnY7DNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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