SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f6ad569f6f80eef9084a9e480c56b0d794e32b3a63afd036d3219cec3dd968' 
  AND token = 'mlKhqa/viLXe0dybv3VltLuY4M2DBDYxptHQQjnsZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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