SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afd0f36246dcb2dfcb1bfd70b48fbce98815ea87eafdb89b48ce9550f502a3a' 
  AND token = 'AASRAt7VmgS/N+8UDuw9QXLAYUmJzFhdqFEsMXC5juc=' 
  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"
    }
  }
}